Milling-machine



(N l.) 3 Sheets-Sheet 1.

A. H. BRAINARD.

MILLING MACHINE.

No. 367,954. Patented Aug. 9, 1887.

Fig 1 WITNEEEEE. INVENTIIIFK.

( Modem 3 Sheets-Sheet 2.

A. H. BRAINARD.

MILLING MACHINE.

No. 367,954 Patented Aug. 9,1881

Fig.1

WITNESSES. INVENTDR.

N PETER5, PhoImLilMgmpher. wnmn m, D. l;

(No Model.) 3 Sheets$heet 3.

A. H. BRAINARD.

MILLING MACHINE.

No. 367,954. Patented Aug. 9, 1887.

WITNESSES- 1 Fig. 6.

as from the left inthose figures.

UNITED STATES PATENT OFFICE.

AMOS H. BRAINARD, OF HYDE PARK, MASSACHUSETTS.

MILLING-MACHINE.

SPECIFICATION forming part of Letters Paten t No. 367,954, dated August 9, 1887.

Application filed April 23, 1887. Serial No. 235.8 14. (No model.)

To all whom it may concern:

Be it known that I, AMos H. BRAINARD, of Hyde Park, in the county of Norfolk and State of Massachusetts, have invented a new and useful Improvementin Milling-Machines, which will, in connection with the accompanying drawings, be hereinafter fully described, and specifically defined in the appended claims.

In said drawings, Figure 1 is a side elevation of a machine embodying my invention. Fig. 2 is a detached sectional elevation, the section being taken as on line Z, Figs. I and 3, and the view as from the right in Fig.- 1. Fig. 3 is a detached top plan view of the-front portion of the machine, aportion of the table and turntable being broken away to show interior parts. Fig. 4. is a vertical section similar to Fig. 2, and showing a modification of certain of the parts shown in that figure. Fig. 5 is an enlarged detached vertical section taken as on line Y Y, Figs. 2 and 3,and viewed enlarged detached elevation taken as from the right of Fig. 1, and showing the feed-tripping device.

My invention relates to that class of ma chines known as universal millingmachines, wherein the work-supporting bed is susceptible of four distinct movements, to

' wit: first, vertical; second, horizontal in a direction parallel with the axis of the cuttingtool; third, horizontal in a line transverse to the axis of the cutting-tool, and, fourth, a vibrating or swinging motion upon an axis in a horizontal plane, by which the table is arranged oblique to the axis of the cutting-tool; and it consists in features of novelty hereinafter fully described, and pointed out in the claims.

Referring again to the drawings, A represents the frame or standard, 'formed hollow, with a suitable base and with journal-box bearings at its top, wherein is supported the cutter-arbor 13, shown as carrying the cutter-v spindle a, the cone-pulley O, by which power is communicated to the machine by a be1t,and the cone D, which by a belt thereon imparts motion to cone-pulley E, secured on arbor i, journaled in hearings in bracket P, secured to standard A. A gimbal or universal joint, F, connects arbor 12 with the hollow arbor b,

Fig. 6 is an in which is telescopically arranged thearbor d, the two being interlocked, to secure coincident rotation', by a spline held in place by pin a, secured in b and engaging in alongitudinal groove in d, as shown.

The foregoing parts being old bothiu construction and arrangement need be no further described.

A knee, G, is gibbed upon dovetail H of standard A and is vertically adjusted by screw I, threaded in boss J. A gear secured on said screw and driven by means of an enmeshinggear, Q, journaled in the bracket, serves as the means of moving the screw up and down in its nut J, and thus vertically adjusting the knee in a well-known manner.

At the top of knee G is formed the dovetail N, on which is gibbed the bed K, that is adjusted toward or from standard A by means of screw-shaft R, which is secured from lineal displacement in the knee and is threaded in lug S, secured to the under side of the bed, as is shown in Fig. 2.

Upon bed K is mounted the turn-table L, formednpon its under side witha concentric hu'b, j, fitting into a corresponding recess in the bed, (see Figs. 2, 5,) said hub serving as the pivotal axis of the turn-table. Said turn-table is rigidly secured to the bed at the desired angle by means of bolts 70, (shown by dotted lines in Fig. 3 and by solid lines in Figs. 2, 4,) said boltspassing up through arc-like slots Z in bed K, and being threaded in the turn-table. By thus locking the turn table upon opposite sides of its pivotal hub the locking-bolts are at a material distance apart, and hence the table is much more rigidly and firmly secured to the bed than would be possible if such locking was at the center.

The work-table M is formed with a dovetail, O, which is gibbed in a corresponding groove in turn-table L, as shown in Fig. 5. Said table M is lineally adjusted by means of screw T, journaled and shouldered in lugs U, secured to the ends of the table, and threaded in nut m, whichis secured in boss a, formed in the into receive a crank, as shown, by which to rapidlymove the table M. by hand; but for im parting a lineal-feed motion to said table when the cutter or spindle a is operative, as also to automatically stop such feed motion, I employ the following devices:

An arbor, g, journaled in lugs t, formed on bed K, is driven by telescopic arbor (l by means of their respective gears c f, Figs. 1, 2, 3, said gear 0 and arbord being held in proper relation to gear f by the curved arm a, one sleeve 22 of which supports arbor (I, while its other sleeve 1) is arranged on arbor 9. (See Figs. 2, 3.) Upon arbor g, at the center of the machine, is secured the endless screw j), Fig. 2, which engages tangent wheel q, said screw and wheel constituting what is known as a wormgear. 7 The tangent wheel q is secured on and drives the short vertical stud or arbor a, on the upper end of which is secured the beveled gear 10, which at diamctrically-opposite points engages and drives gears ft m, journaled in bosses y 9 formed in the interior of and integrally with turn-table L, as shown in Figs. 2, 3. I

Between gears 00 is arranged the sleeve-like clutch 2, through which and gears the screw T passes, the gears revolving independently of the screw except as hereinafter described, but the clutch being permanently interlocked with the screw by a spline, 17, Fig. 5, secured in the clutch and engaging in the longitudinal groove extending the length of the screw. Therefore whenever the clutch is revolved, as will be explained, the screw is revolved with it.

The ends of clutch s, as also the inwardly projecting sleeve-like ends of gears m, are correspondingly toothed, as shown in Figs. 2, 3, 4, and said clutch is of less length than the space between said gears, so that when it is arranged midway between them. it can, together with screw T, remain inactive while the gears revolve; but when moved toward either gear, so as to interlock its teeth thcrewith,then the clutch and screw will be rotated coincicloudy with the gear, and, as gears rv revolve always in opposite directions by reason of their engaging gear to at opposite sides thereof, therefore the movement of screw T may be reversed at will by merely changing the engagement of the clutch with the proper gear, and hence table M and the work thereon carried by the screw may be automatically fed in either direction.

For the purpose of automatically stopping the feeding movement of table M by disengaging clutch c from the gear :cby which the screw is being rotated, I employ the lever 2, pivoted at 3 in turn-table L, Fig. 5, and formed with a circular open portion to receive clutch z, with which the lever is engaged by means of semicircular gibs 4., seated in a conceir tric groove in the clutch and engaged by the pivotal plug screws 5, that are threaded in the lever. Near the front of the turn-table this lever is formed with a transversely-elem gated passage, 6, terminated at each end by an inclined face, as shown in Fig. 6,while aeonical-ended pin, 7, is seated in the turn-table and is habitually raised by helical spring 8 to the limit permitted by the collar of the pinengaging plate 13, secured to the table. To depress said pin, and by the wedge-like action of its conical end force the levcrlatcrally, and thereby disconnect clutch z from the gear m with which it may be engaged, I employ the double-inclined block 9, adjustably secured to traveling table M by bolt 10, seated in aT'slot in the table and having aknurled nut, 11, by which to lock the block 9 firmly in place at any desired point, and by positioning saidbloek on the proper side of pin 7 and at the proper distance therefrom the feed will be thrown out of gear at the desired point by the block depressing the pin and the pin moving thelcver to an extent to disengage the clutch from the gear.

In order to lock lever 2 when clutch is intermediate between gears 03, I employ the pin 12, Fig. 2, .1, arranged just in rear of pin 7, and depressed by a helical spring, as shown in Fig. 5. This pin has a conical point,and to lock lever 2 it enters a conical cavity,1 l-, formed therein, as shown in Figs. 8, 5, the contact of the pin with the lever serving to hold the latter in position, and so prevent clutch z from being moved by jar or concussion into contact with gears x,- but the lever is readily moved by moderate force withoutfirst raising the locking-pin, as the inclined walls of hole 14 move the pin upward when force is applied to move the lever laterally.

Instead of employing endless screw p and tangent wheel 1 as a worm-gear for transmitting the rotary motion of arbor 1/ to screw T, the means shown in Fig. 4 may be employed, where stud s is shortened and seated in the body of bed K and carries the large bevel gear 16, seated in. a recess in the upper face of bed K, while the gear is secured to the upper end of said stud and engages gears w, x, as before described, said gear 16 being driven by a pinion, 15, secured 011 arbor g. By employing this modification the slot 71. in the checks of knee Gwhich with the worm-gear are requisite for arbor to ad mit the out-and-in adjusting movement of bed Kare avoided, as arbor g is journaled in the body of bed K above said knee; but in view of the precision of feed of the worm-gear I prefer it to the devices shown in Fig. 4-.

Among the advantages of myimprovements is the fact that telescopic shaft 1) d, aside from its telescopic action, has but one movement, and that in a vertical plane, while if geared directly to screw T it would be required to move not only up and down as knee G and the superineumbent parts were raised and lowcred, but also laterally as the work-table was moved lineally, while by the swiveling of the table the action of said shaft would be still further complicated.

I claim as my invention-'- 1. In a milling-machine, the combination, with the telescopic arbor, of a horizontal arbor journaled in the bed and geared with and driven by the telescopic arbor, the table-feeding screw provided with gearing through which it may be driven, and intermediate gearing connected with the gears on said screw and horizontal arbor and adapted to transmit the motion of the arbor to the screw, substantially as specified.

2. In a milling-machine, the combination of a telescopic arbor connected with its drivingarbor by a gimbal' or other universal joint, a horizontal arbor geared with and driven by said telescopic arbor, a gear secured on said horizontal arbor in theinterior of the machine, a vertical arbor or support carrying two gears, one of which-is enmeshed with and driven by the interior gear on said horizontal arbor and the other is at opposite sides enmeshed with two independent gears arranged to revolve at will idly on the table-feeding screw, said screw threaded in a nut inthe turn-table and shouldered in the work-table, and a clutch mechanism bywhich, at will, to interlock with or liberate from said screw either of said gears mounted thereon, whereby said screw may at will be revolved and driven in either direc-' tion, or may remain idle, while allsaidgears continue their respective rotary movement without change in the direction or speed thereof, substantially as specified.

3. In a milling-machine, the combination of telescopic arborb d, driven by connection of a gimbalor" other universal joint, arbor g, geared with and driven by said telescopic arbor, endless screw 19, secured on said arbor g, tangent wheel q, mounted on arbors and driven by screw 1), gear 10, secured on and driven by arbor 8, gears 00, arranged on opposite sides of gear w and driven thereby, screw T, arranged from either of said gears, substantially as speciv 4. The combination, with clutch z and lever 2, pivoted at one side thereof and pivotally connected therewith, and formed with opening 6, having inclined ends, as shown, of conical-ended pin 7, provided with an elevatingspring and an automatic depressing device, substantially as specified.

5. The combination of clutch z, lever 2, pin 7, with its elevating-spring, adjustable block 9, and locking-pin 12, provided with a depressing-spring, all constructed and combined to operate substantially as specified.

6. The combination, with turn-table L, interlocked with and supporting work-table M and 'formed with a concentric pivotal hub, of 60 bed K, formed with a concentric recess to re eeive said hub, and the arc-like open slots Z, having a radius point or center in common with but a radius greater than said hub, and lockiu g-bolts 7c, seated in said slots and threaded in the turn-table, whereby the latter may be locked in position by said bolts arranged out-' side the periphery and on opposite sides of said pivotal hub, substantially as specified.

AMOS H. BRAINARD. 

